The University of Hawaii sent students and faculty an unsettling email Monday implying imminent North Korean nuclear activity.

The school sent its community an email titled “Subject: in the event of a nuclear attack” to 50,000 students and 10,000 faculty and staff members, The Washington Post reported. Hawaii is located roughly 4,600 miles from North Korea.

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“In light of concerns about North Korea missile tests, state and federal agencies are providing information about nuclear threats and what to do in the unlikely event of a nuclear attack and radiation emergency,” the university wrote in the email.

The school informed the community that its 10 campuses would use a siren system and sheltering-in-place to respond to such a crisis.

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Daniel Meisenzahl, the University of Hawaii spokesman who sent the email, took full responsibility.